Method and apparatus for noncontact inspection of engine blades

Details Method and apparatus for noncontact inspection of engine blades Method and apparatus for noncontact inspection of engine blades

1991-03-06

1992-11-10

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356376, G01N 2186

Patent

active

051626594

ABSTRACT:
A laser scanning device is employed in conjunction with a unique blade mounting assembly to provide for the noncontact inspection of turbojet engine blades. The laser scanner provides a stationary laser scanning beam. The blade mounting assembly includes an elevation control assembly and a rotatable table for shifting a turbojet engine blade through the laser beam along both axial and rotational axes. A universal adaptor assembly is provided to allow for the attachment of a variety of turbojet engine blade types and sizes to the blade mounting assembly. The method of inspecting turbojet engine blades includes the steps of providing an energy beam, shifting the blade to be inspected through the beam along both axial and angular axes, determining the blade chord width and twist from the measured beam blockage, and visually marking the substandard portions of the blade.

REFERENCES:
patent: 3894802 (1975-07-01), Higgins
patent: 4183672 (1980-01-01), Raber et al.
patent: 4467214 (1984-08-01), Ito et al.
patent: 5026165 (1991-06-01), Faville

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